| SC 13G/A | 2013-02-13 | WELLS FARGO & COMPANY/MN | OSI SYSTEMS INC | 1,648,958 | 8.4% | EDGAR |
| SC 13G/A | 2013-02-11 | VANGUARD GROUP INC | OSI SYSTEMS INC | 1,175,449 | 5.9% | EDGAR |
| SC 13G/A | 2013-02-08 | BlackRock Inc. | OSI SYSTEMS INC | 1,523,261 | 7.6% | EDGAR |
| SC 13G/A | 2013-02-07 | WADDELL & REED FINANCIAL INC | OSI SYSTEMS INC | 740,045 | 3.7% | EDGAR |
| SC 13G | 2012-02-14 | WADDELL & REED FINANCIAL INC | OSI SYSTEMS INC | 570,045 | 2.9% | EDGAR |
| SC 13G/A | 2012-02-10 | BlackRock Inc. | OSI SYSTEMS INC | 1,417,711 | 7.2% | EDGAR |
| SC 13G/A | 2012-02-09 | VANGUARD GROUP INC | OSI SYSTEMS INC | 1,009,437 | 5.1% | EDGAR |
| SC 13G/A | 2012-01-25 | WELLS FARGO & CO/MN | OSI SYSTEMS INC | 1,355,806 | 6.9% | EDGAR |
| SC 13G/A | 2011-02-14 | WELLINGTON MANAGEMENT CO LLP | OSI SYSTEMS INC | 325,484 | 1.7% | EDGAR |
| SC 13G/A | 2011-02-11 | CHOPRA DEEPAK | OSI SYSTEMS INC | 855,565 | 4.3% | EDGAR |
| SC 13G | 2011-02-10 | VANGUARD GROUP INC | OSI SYSTEMS INC | 977,756 | 5.2% | EDGAR |
| SC 13G | 2011-02-07 | BlackRock Inc. | OSI SYSTEMS INC | 1,352,634 | 7.2% | EDGAR |
| SC 13G/A | 2011-01-20 | WELLS FARGO & CO/MN | OSI SYSTEMS INC | 1,788,475 | 9.6% | EDGAR |
| SC 13G/A | 2010-02-12 | WELLINGTON MANAGEMENT CO LLP | OSI SYSTEMS INC | 1,021,526 | 5.8% | EDGAR |
| SC 13G/A | 2010-02-12 | CHOPRA DEEPAK | OSI SYSTEMS INC | 1,052,746 | 5.6% | EDGAR |
| SC 13G/A | 2010-02-10 | BlackRock Inc. | OSI SYSTEMS INC | 887,155 | 5.0% | EDGAR |
| SC 13G/A | 2010-02-08 | DIMENSIONAL FUND ADVISORS LP | OSI SYSTEMS INC | 791,291 | 4.5% | EDGAR |
| SC 13G | 2010-01-29 | BlackRock Inc. | OSI SYSTEMS INC | 925,859 | 5.3% | EDGAR |
| SC 13G/A | 2010-01-25 | WELLS FARGO & CO/MN | OSI SYSTEMS INC | 2,196,576 | 12.4% | EDGAR |
| SC 13G | 2009-05-01 | WELLS FARGO & CO/MN | OSI SYSTEMS INC | 2,942,688 | 16.5% | EDGAR |